According to its production process, there are currently two types of mullite insulation bricks: sintered mullite bricks and fused mullite bricks
1. Sintered mullite bricks are mainly made from high alumina bauxite clinker, with a small amount of clay or raw alumina added as a binder, and are formed and fired.
2. Electric melted mullite bricks are made from high alumina, industrial alumina, and refractory clay as raw materials, with the addition of charcoal or coke particles as reducing agents. After forming, they are manufactured using the reduction electric melting method.
The mullite insulation bricks made by these two methods have larger crystallization of fused mullite than sintered mullite, and better thermal shock resistance than sintered products. Their high-temperature performance mainly depends on the content of alumina and the uniformity of the distribution of mullite phase and glass. Mainly used for hot blast stove top, blast furnace body and bottom, glass melting furnace heat storage chamber, ceramic sintering kiln, dead corner lining of petroleum cracking system, etc.
Therefore, when choosing mullite insulation bricks, we also need to consider the cost-effectiveness of sintered mullite bricks and fused mullite bricks, and use mullite insulation bricks according to specific kiln conditions.
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